The ornamental design for a mound-type plant cage, as shown and described.
FIG. 1 is a perspective view of a mound-type plant cage showing my new
design, the broken line showing of a plant is for illustrative purposes
only and forms no part of the claimed design;
FIG. 2 is a front elevation view of the mound-type plant cage, the rear
elevation view being a mirror image thereof;
FIG. 3 is a left side elevation view of the mound-type plant cage, the
right side elevation view being a mirror image thereof;
FIG. 4 is a top plan view of the mound-type plant cage; and,
FIG. 5 is a bottom plan view of the mound-type plant cage.